LARVAE OF DECAPOD CRUSTACEA 



417 



antennae are large biramous organs with long setae, by means of which the animal 

 swims actively, while the maxillipedes and legs are coiled up and functionless. Moulting 

 takes place in a few hours, and a normal Phyllosoma appears. To the first stage Gilchrist 

 gave the name Naupliosoma. It is clear that the naupliosoma represents the prezoeal 

 stage which, in this case alone among the Loricata, so far as is known, retains the 

 swimming antenna, as in some Brachyura. If the prezoea can rightly be regarded as a 

 reminiscence of the nauplius, the name naupliosoma is well chosen. Gilchrist suggests 

 that this active stage is retained in order that the surface may be reached more rapidly 

 than a normal Phyllosoma would be able to do. 



Table VI. List of stations at zv/iich Phyllosomas o/Panulirus, Form D, were taken 



Table VII. Measuremetits {in mm.) of Phyllosomas belonging to Panulirus, Fr- ,n D 



